<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        .header {
            height: 100px;
            background-color: #333;
            color: #fff;
            text-align: center;
            line-height: 100px;
        }
       .navbar {
            height: 50px;
            background-color: #666;
            color: #fff;
            text-align: center;
            line-height: 50px;
        }
       .focus {
            height: 300px;
            background-color: #999;
            text-align: center;
            line-height: 300px;
        }
        .contentl {
            float: left;
            width: 40%;
            height: 100%;
            background-color: #f00;
            text-align: center;
            line-height: 500px;
        }
       .contentr {
            float: right;
            width: 60%;
            height: 100%;
            background-color: #0f0;
            text-align: center;
            line-height: 500px;
        }
         .footer {
            height: 100px;
            background-color: #916363;
            color: #b32d2d;
            text-align: center;
            line-height: 100px;
        }
    </style>
</head>
<body>
    <div class = "header">头部</div>
    <div class = "navbar">导航栏</div>
    <div class = "focus">焦点图</div>
    <div class="contentl">左内容</div>
    <div class="contentr">右内容</div>
    <div class = "footer">底部</div>
</body>
</html>